Hi, I have two questions. I have the following program:
type
StackObj*[T] = object
data: seq[T]
size: int
StackRef*[T] = ref StackObj[T]
proc newStackObj*[T](vals: varargs[T]): StackObj =
var tempData = newSeq[T]()
for datum in vals: tempData.add(datum)
return StackObj[T](data: tempData, size: tempData.len())
proc `$`*[T; C : StackObj[T] | StackRef[T]](stack: C): string =
return $stack.data
proc pushback*[T; C : StackObj[T] | StackRef[T]](stack: var C; val : T) =
stack.data.add(val)
stack.size.inc()
proc popback*[T; C : StackObj[T] | StackRef[T]](stack: var C): T =
stack.size.dec()
return stack.data[stack.size]
proc empty*[T; C : StackObj[T] | StackRef[T]](stack: C): bool =
return stack.size == 0
static:
var stack = newStackObj[int](10) # cannot instantiate:
newStackObj[int]; got 1 type(s) but expected 2
var stack = newStackObj(10) # cannot instantiate: 'StackObj'
# var stack = StackRef[int](data: @[12], size: 1)
# stack.pushback(2)
# echo stack.popback()
# echo $stack
1. Can you explain these error messages?
2. It seems that I am writing [T; C : StackObj[T] | StackRef[T]] quite a lot.
Any tips to go around this?
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Also, I'd love if there's a way to turn varargs into a vector (preferably
R-valued)
